A typical rotary screw atmosphere compressor has two interlocking helical rotors within a housing. Air will come in through a valve, typically called the inlet valve and is definitely taken into the space between your rotors. As the screws convert, they reduce the level of the air, hence increasing the pressure.
The heart of an air compressor is the screw element which is also called air-end. The air-end can be the most important component of any screw-type compressor. It’s that area of the machine where in fact the actual compression occurs. It is the heart of the rotary screw air flow compressor.
A Rotary Screw Atmosphere Compressor is a compressor that runs on the rotary-type Screw Air Compressor china positive displacement mechanism, 
called a rotary screw, air-end. … Rotary Screw Compressors also use two inter-twined helical designed screws, referred to as rotors, to compress the atmosphere.